<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert title="注意：只允许为第三极分类设置相关参数！" type="warning" :closable="false" show-icon>
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
                        v-model="selectCateKeys"
                        :options="catelist"
                        :props="cateProps"
                        @change="handleChange"></el-cascader>
                </el-col>
            </el-row>
            <!-- tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible = true"
                        >添加参数</el-button
                    >
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag
                                    v-for="(item, i) in scope.row.attr_vals"
                                    :key="i"
                                    closable
                                    @close="handleClose(i, scope.row)"
                                    >{{ item }}</el-tag
                                >
                                <!-- 输入文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)"
                                    >+ New Tag</el-button
                                >
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button
                                    size="mini"
                                    type="primary"
                                    icon="el-icon-search"
                                    @click="showEditDialog(scope.row.attr_id)"
                                    >修改</el-button
                                >
                                <el-button
                                    size="mini"
                                    type="danger"
                                    icon="el-icon-delete"
                                    @click="removeParams(scope.row.attr_id)"
                                    >删除</el-button
                                >
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible = true"
                        >添加属性</el-button
                    >
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag
                                    v-for="(item, i) in scope.row.attr_vals"
                                    :key="i"
                                    closable
                                    @close="handleClose(i, scope.row)"
                                    >{{ item }}</el-tag
                                >
                                <!-- 输入文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)"
                                    >+ New Tag</el-button
                                >
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button
                                    size="mini"
                                    type="primary"
                                    icon="el-icon-search"
                                    @click="showEditDialog(scope.row.attr_id)"
                                    >修改</el-button
                                >
                                <el-button
                                    size="mini"
                                    type="danger"
                                    icon="el-icon-delete"
                                    @click="removeParams(scope.row.attr_id)"
                                    >删除</el-button
                                >
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <!-- 添加参数的表单对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <!-- 修改参数的表单对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                // 商品分类列表
                catelist: [],
                // 级联选择框的配置对象
                cateProps: {
                    expandTrigger: 'hover',
                    value: 'cat_id',
                    label: 'cat_name',
                    children: 'children',
                },
                // 级联选择框双向绑定到的数组
                selectCateKeys: [],
                // 被激活的页签名称
                activeName: 'many',
                // 动态参数的数据
                manyTableData: [],
                // 静态参数的数据
                onlyTableData: [],
                // 控制添加对话框的显示与隐藏
                addDialogVisible: false,
                //添加参数的表单数据对象
                addForm: {
                    attr_name: '',
                },
                //添加表单的验证规则对象
                addFormRules: {
                    attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }],
                },
                // 控制修改对话框的显示与隐藏
                editDialogVisible: false,
                //修改的表单数据对象
                editForm: {},
                // 修改表单的验证规则对象
                editFormRules: {
                    attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }],
                },
            };
        },
        created() {
            this.getCateList();
        },
        methods: {
            // 获取所有的商品分类列表
            async getCateList() {
                const { data: res } = await this.$http.get('categories');
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品分类失败');
                }
                this.catelist = res.data;
            },
            // 级联选择框选中项变化，会触发这个函数
            handleChange() {
                this.getParamsData();
            },
            // tab 页签点击事件的处理函数
            handleTabClick() {
                console.log(this.activeName);
                this.getParamsData();
            },
            // 获取参数的列表数据
            async getParamsData() {
                if (this.selectCateKeys.length !== 3) {
                    this.selectCateKeys = [];
                    this.manyTableData = [];
                    this.onlyTableData = [];
                    return;
                }
                // 证明选中的是三级分类
                console.log(this.selectCateKeys);
                // 根据所选分类的ID 和当前所处的面板，获取对应的参数
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: { sel: this.activeName },
                });
                if (res.meta.status !== 200) {
                    return this.$message.error('获取参数列表失败');
                }

                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
                    // 控制文本框的显示与隐藏
                    item.inputVisible = false;
                    // 文本框中输入的值
                    item.inputValue = '';
                });
                if (this.activeName === 'many') {
                    this.manyTableData = res.data;
                } else {
                    this.onlyTableData = res.data;
                }
            },
            // 监听对话框的关闭事件
            addDialogClosed() {
                this.$refs.addFormRef.resetFields();
            },
            //点击按钮，添加参数
            addParams() {
                this.$refs.addFormRef.validate(async valid => {
                    if (!valid) return;
                    const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                        attr_name: this.addForm.attr_name,
                        attr_sel: this.activeName,
                    });
                    if (res.meta.status !== 201) {
                        return this.$message.error('添加参数失败');
                    }
                    this.$message.success('添加参数成功');
                    this.addDialogVisible = false;
                    this.getParamsData();
                });
            },
            //点击按钮，展示修改的对话框
            async showEditDialog(attrId) {
                // 查询当前参数的信息
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
                    params: { attr_sel: this.activeName },
                });
                if (res.meta.status !== 200) {
                    return this.$message.error('获取参数信息失败！');
                }
                this.editForm = res.data;
                this.editDialogVisible = true;
            },
            // 重置修改的表单
            editDialogClosed() {
                this.$refs.editFormRef.resetFields();
            },
            // 点击按钮修改参数信息
            editParams() {
                this.$refs.editFormRef.validate(async valid => {
                    if (!valid) return;
                    const { data: res } = await this.$http.put(
                        `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                        {
                            attr_name: this.editForm.attr_name,
                            attr_sel: this.activeName,
                        },
                    );
                    if (res.meta.status !== 200) {
                        return this.$message.error('修改参数失败');
                    }
                    this.$message.success('修改参数成功');
                    this.getParamsData();
                    this.editDialogVisible = false;
                });
            },
            //根据id删除对应的参数项
            async removeParams(attrId) {
                const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning',
                }).catch(err => err);
                // 用户取消了删除的操作
                if (confirmResult !== 'confirm') {
                    return this.$message.info('已取消删除！');
                }
                // 删除的业务逻辑
                const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`);
                if (res.meta.status !== 200) {
                    return this.$message.error('删除参数失败');
                }
                this.$message.success('删除参数成功');
                this.getParamsData();
            },
            //文本框失去焦点 或者按下 enter 都会触发
            async handleInputConfirm(row) {
                if (row.inputValue.trim().length === 0) {
                    row.inputValue = '';
                    row.inputVisible = false;
                    return;
                }
                // 如果没有return 则证明输入的内容，需要做后续处理
                row.attr_vals.push(row.inputValue.trim());
                row.inputValue = '';
                row.inputVisible = false;
                // 需要发起请求 保存这次操作
                this.saveAttrVals(row);
            },
            // 将对 attr_vals 的操作，保存到数据库
            async saveAttrVals(row) {
                // 需要发起请求 保存这次操作
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join(' '),
                });
                if (res.meta.status !== 200) {
                    return this.$message.error('修改参数项失败!');
                }
                this.$message.success('修改参数项成功!');
            },
            //点击按钮展示文本输入框
            showInput(row) {
                row.inputVisible = true;
                //让文本框自动获得焦点
                // $nextTick 方法的作用就是，当页面上的元素被重新渲染之后，才会指定回调函数中的代码
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },
            //删除对应的参数可选项
            handleClose(i, row) {
                row.attr_vals.splice(i, 1);
                this.saveAttrVals(row);
            },
            //
        },
        computed: {
            // 如果按钮需要被禁用则返回true 否则false
            isBtnDisabled() {
                if (this.selectCateKeys.length !== 3) {
                    return true;
                }
                return false;
            },
            // 当前选中的三级分类的ID
            cateId() {
                if (this.selectCateKeys.length === 3) {
                    return this.selectCateKeys[2];
                }
                return null;
            },
            //动态计算标题的文本
            titleText() {
                if (this.activeName === 'many') {
                    return '动态参数';
                }
                return '静态属性';
            },
        },
    };
</script>

<style lang="less" scoped>
    .cat_opt {
        margin: 15px 0;
    }
    .el-tag {
        margin: 10px;
    }
    .input-new-tag {
        width: 120px;
    }
</style>
